Engraving-machine.



No. 642,475. Patnted Ian. 30, 1900.

J. F. MUB PHYj ENGRAVING MACHINE.

(Application filed Aug. 21, 1899.)

(N oModel.) 2 Sheets-Sheet I.

WITNESSES INVENTOH a iv/w T JhzFJiio 123.10. 37- Y M W L- no. 642,475. Patented Ian. 30, I900.

.1. r. MURPHY.

ENGRAVING MACHINE.

(Application filed Aug.- 21, 1899.) (No Model.) 2 Shaats$heet 2.

WITNESSES: INVENTOI? A 77'OBNEYS,

NITED STATES PATENT OFFICE.

JOHN F. MURPHY, or BAYARD, IOWA.

ENGRAVlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 642,475, dated January '30, 1900.

' Application filed August 21, I899. Serial No. 727,947. (No model.)

To aZZ whom it may concern Be it known that I, J OHN' F. MURPHY, 0f Bayard, in the county of Guthrie and State of Iowa, have invented a new and useful Improvement in Engraving-Machines, of which the following is a specification.

The object of my invention is to provide an engraving machine for engraving letters, words, names, or designs from a given pattern onto a metal or other surface, the idea being to have a relatively large pattern and a tracer which is made to follow the lines of such pattern and to transmit all of its motions exactly to an engraving-tool which is made to engrave the letters, words, names, or designs on a reduced scale of any desired size.

To this end it consists in the peculiar construction and arrangement of parts whereby the machine is simply, quickly, and accurately adjusted, as will be hereinafter fully described with reference tothe drawings, in

'which tion. Fig. 2 is a side elevation, partly in section. Fig. 3 is a horizontal section online 3 3 of Fig. 1. Fig. 4 is a perspective View of a part of the work-table. Fig. 5 is a section on line 5 5 of Fig. 1. Figs. 6, 7, and 8 are enlarged sections on lines 6 6, 7 7, 8 8, respectively, of Fig. 1. Fig. 9 is a perspective detail of the engraving-tool, and Fig. 10 is a section on line 10 10 of Fig. 1.

In the drawings, A represents an upright standard mounted upon a suitable base and forming the main frame of the machine. At the bottom of this standard there is an offsetting-shoe B, in which is mounted upon diametrical pivots a a the gimbal-ring C, while within the gimbal-ring, upon pivots o. a at right angles to the pivots a a, there is mounted the lower end of a main sway-bar D. As its support at the lower end within the gimbalring is a universal joint, it permits the swaybar at its upper end to move freely in all directions in tilting about its lower end.

' Near the middle of the standard A there is bolted a fixed rectangular bracket E, to the outer ends of which is bolted a horizontal bar E, having a toe-clip e and screw-bolt or setscrew a. On the upper edges of the bracket E there are formed or attached lugs e 6 against which bears one edge of the patternboard E which is thus clamped between the toe-clip e and said lugs e e and is held rigidly thereby, but may be removed and adjusted horizontally when desired. On top of the pattern-board is the pattern-plate E whose edge is flanged and turned down and clamped between the pattern-board and a longitudinal strip E by set-screws e 6 which may be loosened to permit any variety of patternplates to be secured upon the top of the board. These pattern-plates carry type or may have inscribed thereon the letters,word s, names, or designs which it is desired to engrave. The lugs e e are formed on the two parallel side bars of the open frame or bracket E and only project a short distance above the same, and the clamping strip E is thinner than the board E as seen in Fig. 2, so as to give room below the clamping-strip E for the lugs e to bind against the board E whereby the pat tern-plates may be removed without loosening the pattern-board E At the upper end of the standard A there is a forwardly-projecting arm A, on which is hung by a gimbal or universal joint a swinging tracer-bar F, whose lower end traces the pattern. This universal joint is composed of a U-shaped bar G, Fig. 6, having a cross-bar 9 between its legs. The pivots g g of the arm A are carried in bearings in the crossbar g and the round portion of the gimbal-bar G, while the pivots f f of the tracer-bar F are arranged at right angles to g g between the.

legs of the gimbal-bar G. The pivots f f are seated in bearings in a hub 9 which is secured on the tracer-bar by a set-screw 9 This support allows the tracer-bar to swing freely at its lower end like a pendulum in all directions.

The pendent tracer-bar F and the standing 4 sway-bar'D are so connected together that the swinging of the tracer-bar will be imparted to the sway-bar in the same direction, but to a variable extent. For this purpose a telescopic sliding connection is made between these two parts as follows: The upper end of the sway-bar is made hollow, (see Fig. 2,) and in it slides a rod D, which at its upper end carries a gimbal-jointed connection D of the same construction as the gimbal G. This connection D has one set of pivots d 01 connecting to the rod D and another set d d at right angles connecting with a cross-head d which slides up and down on the tracer-bar F. A lift-bar H is arranged parallel with the rod D, is attached at its upper end to the pivots of said rod, slides freely through a vertical hole in a rigid collar A on the top of the sway bar, and at its lower end has a short arm it, that is connected to a cord or chain wound upon a smallwindlass or crankshaft h above. By turning this crank-shaft the rod D and its gimbal connection D with ihe tracer-bar are raised or lowered and the leverage of the tracer-bar F on the sway-bar is varied2'. e., when the gimbal connection D is adjusted to a high point,as in dotted lines, Fig. 2, a definite movement of the tracer-bar willvimpart a very slight motion to the swaybar, and when the connection D is lowered a greater throw will be imparted. To hold the gimbal connection D and its telescopic rod D to its position after being varied by the cord and crank-shaft, a crankscrew 2', Fig. 8, is tapped through the collar at the top of the sway-bar and is made to bind against the said rod D. From this description it will be seen that the tracer-bar swings freely in pendent position from its universal joint above and imparts its motion in the same direction to the sway-bar, which tilts about its universal joint below, and through the adjustable telescopic connection D D the extent of movement imparted from the tracer-bar to the sway-bar may be varied to reduce the throw of the latter to any desired extent. This throw of the sway-bar is transmitted to the graver-tool by means which I will now proceed to describe.

J is the graver-bar, which is a lever arranged crosswise the sway-bar and having a middle yoke or opening inclosing the swaybar and connected to it by fulcrum-pivots jj, Fig. 3, which allow the graver-bar to seesaw up and down, but in all other respects compel the graver-bar to partake of all the motions of the sway-bar. This graver-bar carries at one end a graver-tool K, Fig. 9, which is rigidly connected to the end of the graverbar by a coupling-block 70, so as to be inclined or adjusted in two different planes at right angles to each other. For this purpose a hole is made through this block to receive the end of the graver-bar, and a set-screw It looks it thereon in an adjustable manner. A bolt with a perforation for the graver-tool to pass through, is provided with a nut 70 which allows the graver to be adjusted in the other plane and when said nut is screwed up locks the graver-tool against the side of the coupling-block. Thisconnection permits the graver-tool 7a to be set at any desired angle. The opposite end of the graver-bar J is held down in an elastic manner by a wire or rod L, connected to the floor or base, and a spring l, so that the graver-tool is maintained normally about a quarter of an inch above its work-table and is brought down upon the work by the pressure of the hand on a springarm 25. The spring Z is coiled around the wire L and is held between a collar on and setscrew m at the top and a slidinglink or stirrup n, embracing the wire at one end above the collar and at the other below the spring. This prevents the spring from dropping down when the graver-bar is tilted, as shown in dotted lines, to permit the work to be placed under the tool. When, however, the gravertool is brought down upon the work, the end of the graver-bar presses against and lifts the stirrup n and compresses the spring. By loosening the set-screw the collar, spring, and stirrup may be adjusted higher or lower to regulate the space above the work at which the graver is normally held. For throwing the graver-bar to its dotted position and holding it there while adjusting the work beneath the tool a tilting arm 0 is hinged to the swaybar and has a toe 0, which when the arm 0 is brought down forces the graver-bar to its dotted position and holds it there.

P, Figs. 2 and 4, is the work-table, which consists of a board beneath the graver-tool clamped adjustably between cleats p p by a binding-screw 19. These cleats are formed on a board 9 which has subjacent cleats p p at right angles to the ones above and a setscrew 17, by which the board 19 may be adjusted at right angles to the cleats above. The screw 19 engages with a verticall y-ad j ustable column P, which permits the whole work-table to be raised or lowered. For this purpose a metal yoke P Fig. 10, with a screw-boltP connected to the column P, embraces a vertical plate P which at its upper end is connected to the table-bracket and at the lower end is fastened to an offsetting-bar P from the main standard.

To operate the machine, the tracer is held in the right hand and the end of the graverbar in the left, as shown.

This engraving-machine can be set to engrave letters from one-fortieth to one-fourth the size of pattern-type on the tracer-table. One movement governs the changing of the size of letter, and the operator while sitting in his seat can change the machine from, smallest to largest letters in an instant. When the tracer-arm is standing perpendicular and parallel with the dimension-changing slide, the raising or lowering of the slide does not move the graver. With this machine a person can engrave a line so as to just fill the space it is intended to be engraved in. The proper way to do this is as follows: Set up the type on the pattern-plate to form the word that you wish to engrave; slide the type-table so that the center of the line of type will come under the tracer as it stands perpendicular and parallel with the changing-slide Now place the article to be engraved under the graver so that the center of the space to be engraved will come under the graver. Now move the tracer to the farthest left side of pattern and notice where the graver would come. If it comes outside the space you Wish to engrave in, the machine is set to make too large a letter. Now loosen the lever-clamp that holds the letter-changing slide and turn the little Windlass to the right. This raises the sliding gimbal on the tracer-arm and carries the graver to the right. Keep turning until the graver comes inside the margin of the desired space. Now carry the tracer to the farthest righthand side of pattern and see if the graver comes in the margin. If it does, the machine is set. Then tighten the clamp and the work may be begun. The pattern-table is long enough to hold type for one whole name; but the tracer will not reach more than half the length of the table. Hence I engrave first half of the name, and then slide the table to the left and engrave the last half of the name.

Having thus described myin'vention, what I claim as new, and desire to secure by Letters Patent, is

1. In an engraving-machine, the combination of an upright sway-bar mounted at its lower end upon a universal joint held on a fixed support, an upright tracer-bar hung at its upper end upon a universal joint having a fixed support, and extending down past the upper end of the sway-bar; and a sliding connection between the sway-bar and tracer-bar for varying the leverage exerted by the tracerbar on the sway-bar, and a graver carried by the sway-bar substantially as described.

2. In an engraving-machine, the combination of an upright sway-bar mounted at its lower end upon a universal joint held on a fixed support, and carrying a graver, an upright tracer-bar hung at its upper end upon a universal joint having a fixed support, and extending down past the upper end of the sway-bar, and a sliding connection between the sway-bar and the tracer-bar, said connection being formed through a movable universal joint substantially as described.

3. In an engraving-machine, the combination of a sway-bar mounted at its lower end upon a universal joint, and carrying a gravertool, a tracer-bar hung at its upper end upon a universal joint, a telescopic slide arranged on the upper end of the sway-bar and connected slidably to the tracer by a universal joint, a parallel lift-bar, a Windlass and flexible connection for raising the telescopic slide, and means for looking it in position substantially as described.

4.. In an engraving-machine, the combination with the vertical sway-bar, and the transversely-arranged graver-holding bar; of the rod or wire L, spring Z, collar and set-screw m m, and stirrup 91 substantially as and for the purpose described.

5. In an engraving-machine, the combination of the vertical sway-bar, a transverselyarranged graver-holding bar, having a graver at one end, a spring for holding the graver up,and an adjusting device arranged to throw the graver-bar to a greater range of movement in the same direction as the spring for holding the graver away from the Work-table to permit the insertion of the work substantially as described.

6. In an engraving-machine, the combina tion of a vertical standard having an open' rectangular horizontal metal support E with lugs e e on its upper side, and a toe-clip c with clamp-screw e, and a pattern-board having a strip along its edge, made thinner than the pattern-board and occupying a position above the lugs 6 provided with clamp-screws to clamp the flange of a pattern substantially as described.

7. In an engraving-machine, the combination with the vertical standard A and the graver-tool; of a work-table consisting of an offsetting-arm P vertical plate P verticallyadjustable column P having a yoke embracing said plate, and a surmounting table having slideways at right angles to each other, and clamp-screws for fixing them in position as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. 4

' JOHN F. MURPHY.

Witnesses:

DANIEL VADER,

GEORGE W. DEWEY. 

